Droid network fix

https://github.com/XLabs/Xamarin-Forms-Labs/issues/459
Merge pull request #460 from sami1971/upstream

Droid network fix
Added XLabs.Core project

Conflicts:
	samples/Xamarin.Forms.Labs.Sample.Droid/Resources/Resource.designer.cs

src/Xamarin.Forms.Labs/Xamarin.Forms.Labs.Droid/Resources/Resource.desig
ner.cs

src/Xamarin.Forms.Labs/Xamarin.Forms.Labs.Droid/Xamarin.Forms.Labs.Droid
.csproj

src/Xamarin.Forms.Labs/Xamarin.Forms.Labs.iOS/Xamarin.Forms.Labs.iOS.csp
roj
	src/Xamarin.Forms.Labs/Xamarin.Forms.Labs.sln
	src/Xamarin.Forms.Labs/Xamarin.Forms.Labs/Xamarin.Forms.Labs.csproj